MancJiester Memoirs, Vol. Iviii. {igi^), No.*i. 



II. Note on some products isolated from Soot. 



By Professor EDMUND Knecht, Ph.D., 



AND 



Miss Eva Hibbert. 



(Received and read November 4/h, igij.) 



In a paper on some constituents of "Manchester 

 Soot " read before this Society in 1905 by one of us, 

 soot which had been collected from ordinary household 

 chimneys was extracted successively with water, dilute 

 sulphuric acid, caustic soda and benzene, and the extracts 

 were examined as far as circumstances would permit. 

 The sample under examination was shown to have the 

 following composition : — 



Ammonia (as ammonium sulphate) ... 107 % 



Mineral matter (ash) 



Acid and phenolic constituents 

 Benzene extract (hydrocarbons) 

 Difference (carbon ?) 



19-6% 

 109% 



45-8% 



loo-o % 

 Soot collected in London and in Prague was found to 

 contain much less extractive matter than soot collected 

 in Manchester. 



The benzene extract was subjected to distillation 

 with a view to ascertain whether any definite organic 

 compounds could be isolated by this means, and it was 

 possible to show the presence, in the distillation products, 

 of a beautifully crystallised white hydrocarbon, which 



December lyf/i, igij. 



